Doctors placed Clinton under monitoring for 48 hours when they found the clot. (Wikimedia Commons)

CNN reported Clinton is being treated with anticoagulants. Deputy Assistant Secretary of State Philippe Reines said doctors would monitor her condition through Tuesday, but did not specify the location of the clot.

Clinton suffered the concussion when she fainted as a result of a stomach virus earlier this month. Her staff cited the illness as reason for her to bow out of a Dec. 20 testimony before the House Foreign Affairs Committee about the Sept. 11 attack on the U.S. Consulate in Benghazi, Libya.

She had expected to return to work this week after three weeks out of the office.

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